Key Technologies for Design and Construction of the Daliangshan No.1 Tunnel
The geological conditions of the Daliangshan No.1 Tunnel on the Leshan-Xichang Expressway are com-plex,and the climate conditions are harsh,making it difficult to select the road alignment due to restrictions from the nature reserves.This paper proposes a design concept to minimize the elevation of the ridge crossing section to ensure operational safety.By setting up a fulllength parallel heading,selecting a combination of tunnel boring ma-chine(TBM)method and drilling and blasting method for construction,and optimizing the tunnel ventilation scheme,the challenges regarding construction period and disaster prevention and rescue of the ultra-long tunnel are addressed,reducing construction risks and improving disaster rescue efficiency.The overall function,the construc-tion and operation safety of the Project are optimized.The relevant research and implementation of the Project show that the construction scheme of the main tunnel + full-length parallel heading for ultra-long tunnels is feasible and has certain reference significance for the construction of ultra-long expressway tunnels in western mountainous areas.
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